Factorial Designs

Question 1

Factorial designs

Answer 1

• Simultaneously vary 2+ IVs
• All level of one IV tested at all levels of another IV
• Allows to determine how 2+ IVs interact

Advantage:
-Only design, measure interactions

Disadvantages:

• Add IV, greatly increases total # conditions
• Add between-sub. increase # sub. groups
• Add within-sub. increase # conditions

Question 2

Between-subjects factorial design

Answer 2

All IVs are between-subjects

Question 3

Within-subjects factorial design

Answer 3

All IVs are within-subjects

-Only need to test one group, each subject tested at all conditions

Question 4

Mixed Factorial Design

Answer 4

Has at least one within-subject and at least one between-subject IV

Question 5

To determine factorial design

Answer 5

1. Identify DV
2. Identify IV
3. Identify number of levels for each IV
4. Determine whether each IV is between- or within-subject

Question 6

Factorial designs measure:

Answer 6

Main effect- overall effect of each IV
Interactions- effect of 2(+) variables ACTING TOGETHER that is not the sum of the effects of each IV alone
- Influence of one IV DEPENDS on level of another IV

Question 7

How to determine if interaction is present

Answer 7

Statistical analysis
Graphed data
-NOT parallel, interaction possible
-Horizontal IV: both sloping, main effect likely
-Other IV: spaced far apart, main effect likely